Across
1
Amplified beam of light
4
Push or pull on an object
8
Unit of heredity
9
Blocking of light by a celestial body
10
Fourth state of matter
11
Center of an atom or cell
Down
2
Group of similar cells
3
Nerve cell in the brain
5
Reddish electrical conductor
6
Solid with repeating atomic pattern
7
Basic unit of life
12
Unit of power